Ambrose w



@with 'tt @that @Hinar Letters Patent No. 74,774, dated February 25,1868.

IMPROVEMENT IN PORTABLE GRI'NDVING-MILLS.'

@te ,dgemls referat ni im' .that @etten-tant mit mating part ai 113esmite.

TO LiJ-"WHOMIT 'MAY CONGERN': t

Be it known that I, AMROSE W. STRAUB, of the city of Philadelphia, inthe State of Pennsylvania, have invented a new and useful ImprovementVin the Portable WheatFlouring and Corn-Grinding Mill; and` I do herebydeclare that the following is a full, clear, and exact description oftheconstruction and operation ofthe same, reference being had totheaccompanying drawings, making a part ot' this specification, in which-Figure lis a 'perspective View,V and Figure 2 avertical'section of thesaid improved-mill; Y

Figure 3 being a sectional plane view of the under sigle of the lower orrun-ningv stone, detached- Likev letters o t' reference indicating thesame parte when in theditferent figures. 1 My improvement relates moreespecially tothe portable wheat-flouring and corn-grinding millofMr.`Isaac Straub,l which is now used fextensiveiy in the western andsouthern States, the characteristic of which is, that the lower stone isthe run'ner,-whilst the upper one'is stationary; and the .object of myimprovement is to avoid the possibility ofthe mills getting outoi'tru.m,,a from thevterribly rough and careless handling to which theyare subjected by ,steamboat and railroad transportation', v

. My invention consists in making the supporting-frame of the mill in asingle piece of cast iron, substantially as hereinafter described andshown; and also in securing the detachable coping-ring, curb, andhopper.

stool together, firmly down u'p'on'the szlildV supporting-frame ofthemill, by means of four nutted screw-bolts only, substantially-ashereinafter described'.

Referring to the drawings, A B is the supportingfframe of the mill,Ctheiixed or stationary stone, and

D the running stone, ii'xed upon its supporting spindle E; bthe'dtachable 'coping-ring, d" the curb, F the` hopper-stool, and a5 a5a5 a5 the four nutted screw-bolts. The frame A B is a hollow circularcaseV of iron, cast in one piece, and consisting of an annularfbase, a',from which rise four upright portions, a, a, separated laterallyby fourlarge open spaces, b 6', which aii'od free access to the interior, andofan annular curbsupporter and guard, a", with fourvertically-projectingposts, a* a4, of equal height above thecurb-supporter af". A coping-"ring, Z1,'wit h'in which the upper stone,C, is xed permanently, rests upon the four posts, ai, and is securedaccurately and firmly thereon by means of a bolt, a, whichis screwedvertically into the upper end oi' each' post, a4, so as to projectupward far enough topass through the respective lug of the coping-ringb, and also throughl the foot oi the hopperstooland spindle-bearingF, toreceive a screw-nut, whereby the parts 12' andfF areheld `downrmlyuponthe top of the frame A B, asA shown in iigs. 1 and 2. Within thecurb-supporter a/asheebmetal curb, d, isV fixed, the sides nf whichreachup to the tops of the posts a4, (see fig. 2,) and within thiscurbthe stone, D, rotates, without contact either with the curb or with theupper stone,

its spindle, E, extending down through a roomy hole in the centre ofthebottom of d', and resting, in .tho usual bearing, in the adjustablesupporting-beam G, below the driving-band pullcy e', which is fixed onthe said spindle. Theun-der side of the running stone D has six (more orless)` fan-ribs, d, fixed radially thereto, at equal distances apart,and so as to reach from the spindle E to the periphery of the stone, andbe carried around by the latter, without contact withjthe curb d.

Y It will be seen that, as the described different parts ofthe frame ABare cast togethcr in'one piece of iron, the said frame cannot bewrenched in any of its parts, in transportation, however roughlyhandled, and therefore the `rui'll wiii retain the exact train given toit at the manufactory--a matter ofvthe highestimportance, and, neverbefore secured; and besides, in replacing the stones C D, afterseparating them 4from. the frame A B, for re-dressiug at any timeafteiiusing, there will .not be any adjustment required to bring thefaces ofthe stones exactly parallel to each other.

In'the operation'of thei'an-ribs d, during thc rapid rotaryvmo-tion ofthe running stone D, strong currents' of freshcool air will be steadilydrawnbythem through the hole in the bottom ofthe crib cl',distributed'cver the under side and around theperiphery of the saidstone, and discharged with the flour or mealat the outlet-Y spout, thuskeeping the stone and flour coolanother result oi' great importancqandeffected in the most simple manner.

Having thus fully described my improvement, what I claim as new thereinof inyinvention, andl desire .to secure by Letters Patent, is confinedto the following, viz:

I claim securing hrmlydewn 4together upon the frame A B, cast in onepiece, as shown and described,fthe detachable curb d', copingring b, andhopper-stool F, by vmeans of four nuttedV screw-bolts, a" a? a ad,suhstantiall'y as andfor the purpose therein described.

A. W. STRAUB.

Witn esses l BENJ. Monson, WM. H.- Monrso'n.

